Oregon Revised Statutes Protection from Fire § 479.275

It shall be the responsibility of the tenant of any rental dwelling unit to perform such tests on the smoke alarms or smoke detectors located in a part of the dwelling unit that the tenant is entitled to occupy to the exclusion of others as are recommended by the manufacturer's instructions and immediately notify, in writing, the owner or authorized agent of any deficiencies. Testing intervals shall not exceed six months. It shall also be the responsibility of the tenant during the tenancy to replace any dead batteries, as needed.